ADAFLANGE ADAFLANGE AFO-UK4,UNIFIED CODE U61 4-bolt flange adapters have bolt patterns that will mount on SAE Code 61 flange ports. The ADACONN® ADAFLANGE AFO-UK2 UNIFIED CODE U61 2-bolt flange adapters have bolt patterns that will mount on either of the two diagonal tapped holes on SAE Code 61 flange ports. The smaller flange footprints of both the ADAFLANGE UNIFIED CODE U61 4-bolt and 2-bolt flange adapters permit their ports to be nested closer to one another, which gives one the opportunity to design more compact components and integrated hydraulic systems.